(function (factory) {
    if (typeof define === 'function') {
        define('jquery-metadata', factory);
    }
    else {
        factory();
    }
})(function (require) {
    /*
     * Metadata - jQuery plugin for parsing metadata from elements
     *
     * Copyright (c) 2006 John Resig, Yehuda Katz, Jörn Zaefferer, Paul McLanahan
     *
     * Dual licensed under the MIT and GPL licenses:
     *   http://www.opensource.org/licenses/mit-license.php
     *   http://www.gnu.org/licenses/gpl.html
     *
     */

    /**
     * Sets the type of metadata to use. Metadata is encoded in JSON, and each property
     * in the JSON will become a property of the element itself.
     *
     * There are three supported types of metadata storage:
     *
     *   attr:  Inside an attribute. The name parameter indicates *which* attribute.
     *
     *   class: Inside the class attribute, wrapped in curly braces: { }
     *
     *   elem:  Inside a child element (e.g. a script tag). The
     *          name parameter indicates *which* element.
     *
     * The metadata for an element is loaded the first time the element is accessed via jQuery.
     *
     * As a result, you can define the metadata type, use $(expr) to load the metadata into the elements
     * matched by expr, then redefine the metadata type and run another $(expr) for other elements.
     *
     * @name $.metadata.setType
     *
     * @example <p id="one" class="some_class {item_id: 1, item_label: 'Label'}">This is a p</p>
     * @before $.metadata.setType("class")
     * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
     * @desc Reads metadata from the class attribute
     *
     * @example <p id="one" class="some_class" data="{item_id: 1, item_label: 'Label'}">This is a p</p>
     * @before $.metadata.setType("attr", "data")
     * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
     * @desc Reads metadata from a "data" attribute
     *
     * @example <p id="one" class="some_class"><script>{item_id: 1, item_label: 'Label'}</script>This is a p</p>
     * @before $.metadata.setType("elem", "script")
     * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
     * @desc Reads metadata from a nested script element
     *
     * @param String type The encoding type
     * @param String name The name of the attribute to be used to get metadata (optional)
     * @cat Plugins/Metadata
     * @descr Sets the type of encoding to be used when loading metadata for the first time
     * @type undefined
     * @see metadata()
     */

    (function ($) {

        $.extend({
            metadata:{
                defaults:{
                    type:'class',
                    name:'metadata',
                    cre:/({.*})/,
                    single:'metadata'
                },
                setType:function (type, name) {
                    this.defaults.type = type;
                    this.defaults.name = name;
                },
                get:function (elem, opts) {
                    var settings = $.extend({}, this.defaults, opts);
                    // check for empty string in single property
                    if (!settings.single.length) settings.single = 'metadata';

                    var data = $.data(elem, settings.single);
                    // returned cached data if it already exists
                    if (data) return data;

                    data = "{}";

                    if (settings.type == "class") {
                        var m = settings.cre.exec(elem.className);
                        if (m)
                            data = m[1];
                    } else if (settings.type == "elem") {
                        if (!elem.getElementsByTagName)
                            return undefined;
                        var e = elem.getElementsByTagName(settings.name);
                        if (e.length)
                            data = $.trim(e[0].innerHTML);
                    } else if (elem.getAttribute != undefined) {
                        var attr = elem.getAttribute(settings.name);
                        if (attr)
                            data = attr;
                    }

                    if (data.indexOf('{') < 0)
                        data = "{" + data + "}";

                    data = eval("(" + data + ")");

                    $.data(elem, settings.single, data);
                    return data;
                }
            }
        });

        /**
         * Returns the metadata object for the first member of the jQuery object.
         *
         * @name metadata
         * @descr Returns element's metadata object
         * @param Object opts An object contianing settings to override the defaults
         * @type jQuery
         * @cat Plugins/Metadata
         */
        $.fn.metadata = function (opts) {
            return $.metadata.get(this[0], opts);
        };

    })(jQuery);
});